Binary Fission


 
 
Concept Explanation
 

Binary Fission

Binary fission is an asexual method of reproduction in organisms. In binary fission the parent organism splits (or divides) to form two new organisms. When this happens, the parent organism ceases to exist and two new organisms come into existence. The unicellular organism (or unicellular animal) called Amoeba reproduces by the method of binary fission. This is described below.

  • Amoeba reproduces by binary fission by dividing its body into two parts. This happens as follows:
  • When the Amoeba cell has reached its maximum size of growth, then first the nucleus of Amoeba lengthens and divides into two parts.
  • After that the cytoplasm of Amoeba divides into two parts, one part around each nucleus.
  • In this way, one parent Amoeba divides to form two smaller Amoebae (called daughter Amoebae). And we say that one Amoeba produces two Amoebae. The reproduction in Amoeba by binary fission is shown.
  • The daughter Amoebae produced by the process of binary fission are identical to the parent Amoeba.
  • From the above discussion we conclude that Amoeba reproduces by dividing itself into two. This type of asexual reproduction is called binary fission. Another tiny, unicellular animal called Paramecium also reproduces by the asexual method of binary fission. In multiple fission, the parent organism splits (or divides) to form many new organisms at the same time, 

    Binary fission is one of the major asexual reproduction processes found in several unicellular animals.

                                                            

    NOTE : Asexual reproduction is the production of a new organism from a single parent without the involvement of sex called (or gametes). The new organism produced by asexual reproduction is exactly identical to the parent.

    Sample Questions
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    Question : 1

    Leishmania reproduces asexually by ________________

    Right Option : B
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    Question : 2

    By which method, asexual reproduction occurs in Amoeba :

    Right Option : A
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    Question : 3

    Which of the following are correct ?

    (a) Binary fission is an asexual method of reproduction in organisms.

    (b) In binary fission the parent organism splits (or divides) to form two new organisms.

    (c) The cytoplasm of Amoeba divides into two parts, one part around each nucleus.

    Right Option : D
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    Explanation
     
     
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